The correct answer is option 4: The ambulance was arranged for by his friends and he was immediately taken to the hospital.

To convert a sentence with two actions (arranged and took) into the passive voice, both parts must be changed while maintaining the Simple Past tense.

First Part: "His friends (Subject) arranged (Verb) for the ambulance (Object)."

In passive: "The ambulance (New Subject) was arranged for by his friends."

Note: The preposition "for" must stay attached to the verb "arranged."

Second Part: "(His friends) took (Verb) him (Object) immediately to the hospital."

In passive: "He (New Subject) was immediately taken to the hospital."

The object "him" becomes the subject "he," and "took" becomes "was taken."

The other options are incorrect because:

• Option 1: Uses "would have arranged," which changes the tense from simple past to conditional perfect.

• Option 2: Incorrectly suggests the friends were the ones being arranged, which changes the meaning entirely.

• Option 3: Changes the meaning to suggest the ambulance performed the actions on the friends.